Question: Suppose f(x) = cos x - sin x and g(x) = cos x + sin x. Explain why the graph of (fx g)(x) is equivalent

Suppose f(x) = cos x - sin x and g(x) = cos x + sin x. Explain why the graph of (fx g)(x) is equivalent to the graph of h(x) = cos x after it has been horizontally compressed by a factor of 7

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